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Global and local variables in R
...anual/R-devel/library/base/html/get.html
Here you have a small example:
test.env <- new.env()
assign('var', 100, envir=test.env)
# or simply
test.env$var <- 100
get('var') # var cannot be found since it is not defined in this environment
get('var', envir=test.env) # now it can be found
...
Haskell export current module with additional imported module
...here is a simple solution, just export the module from the module:
module Test
( module Test
, module A
) where
import Prelude()
import A
f x = x
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Best approach to converting Boolean object to string in java
...Object obj) {
return (obj == null) ? "null" : obj.toString();
}
Just test this code:
Boolean b = null;
System.out.println(String.valueOf(b)); // Prints null
System.out.println(Boolean.toString(b)); // Throws NPE
For primitive boolean, there is no difference.
...
Ideal Ruby project structure
... freewill
├── lib/
│ └── freewill.rb
├── test/
│ └── test_freewill.rb
├── README
├── Rakefile
└── freewill.gemspec
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What is the zero for string?
...ints "true"
A string cannot be nil (but a *string can).
You can simply test
if stringId=="" {
To pass a zero string in stringID, use
k := NewKey(c, "kind", "", 0, p)
From the specification :
When memory is allocated to store a value, either through a
declaration or a call of make or ...
Java to Clojure rewrite
...is easy to add more later, but it helps to do a few early on to facilitate testing and prove that your data structures are working..... either way at this point you can actually start writing useful stuff interactively at the REPL
Separately develop data access routines that can persist these struct...
Java JUnit: The method X is ambiguous for type Y
I had some tests working fine. Then, I moved it to a different package, and am now getting errors. Here is the code:
3 Answ...
How can I send large messages with Kafka (over 15MB)?
...bytes should be strictly larger to message.max.bytes. A Confluent employee confirmed earlier today what I suspected: that the two quantities can, in fact, be equal.
– Kostas
Mar 24 '17 at 1:29
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Modifying a query string without reloading the page
...aid. Here it is an example that might help you to implement it properly. I tested and it worked fine:
if (history.pushState) {
var newurl = window.location.protocol + "//" + window.location.host + window.location.pathname + '?myNewUrlQuery=1';
window.history.pushState({path:newurl},'',newur...
Does PowerShell support constants?
...
Use
Set-Variable test -option Constant -value 100
or
Set-Variable test -option ReadOnly -value 100
The difference between "Constant" and "ReadOnly" is that a read-only variable can be removed (and then re-created) via
Remove-Variable te...